Open English Wordnet
Nouns
(n)dunce, dunderhead, numskull, blockhead, bonehead, lunkhead, hammerhead, knucklehead, loggerhead, muttonhead, shithead, dumbass, fuckheada stupid person; these words are used to express a low opinion of someone's intelligence
(n)hammerhead, hammerhead sharkmedium-sized live-bearing shark with eyes at either end of a flattened hammer-shaped head; worldwide in warm waters; can be dangerous